Sin50度（1+根号3乘以tan10度）
=sin50°(1+tan60°tan10°)
=sin50°×(cos60°con10°+sin60°sin10°)/cos60°cos10°
=sin50°×cos(60°-10°)/cos60°cos10°
=sin100°/2cos60°cos10°
=cos10°/cos10°
=1
这里tan60°=√3,cos60°=1/2,sin100°=cos10°